SQL for previous value in column for last 30 days [closed]

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I'm looking for SQL which give me the job, present position, previous position, change date for last 30 days...

Much Appreciated.. Thanks

Answer 1

Revised

SELECT id, j1.position, j2.position, j1.change_date
FROM tb_job j1
JOIN tb_job j2
   on j2.id = j1.id
   and j2.change_date < j1.change_date
   and j2.change_date > (j1.change_date - INTERVAL '30' DAY)
WHERE not exists
(select * from tb_job j
 where j.id = j1.id
 and j.change_date < j1.change_date
 and j.change_date > j2.change_date
)